As like at the start, starting gear will be 4d6x2, add the wealth bonus from occupation they may have. That's how much you have in TU's in stuff like food, water, ammunition and so forth. Again since money is hard to come by, do to the fact that there's not many governments, societies and civilizations are left. To issue and print currency, or to monitor it.
An since the Trade Units work about the same as the Wealth purchase DC's. So instead of a 125 TU, it would be the more cheaper 35 TU then. On what you buy for your gear at the start and depending on who, and where you buy additional items from. If your still confused I can answer any questions you may have okay.